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from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import pycocotools.coco as coco
from pycocotools.cocoeval import COCOeval
import numpy as np
import json
import os

import torch.utils.data as data

class COCO(data.Dataset):
  num_classes = 80
  default_resolution = [512, 512]
  mean = np.array([0.40789654, 0.44719302, 0.47026115],
                   dtype=np.float32).reshape(1, 1, 3)
  std  = np.array([0.28863828, 0.27408164, 0.27809835],
                   dtype=np.float32).reshape(1, 1, 3)

  def __init__(self, opt, split):
    super(COCO, self).__init__()
    self.data_dir = os.path.join(opt.data_dir, 'coco')
    self.img_dir = os.path.join(self.data_dir, '{}2017'.format(split))
    if split == 'test':
      self.annot_path = os.path.join(
          self.data_dir, 'annotations', 
          'image_info_test-dev2017.json').format(split)
    else:
      if opt.task == 'exdet':
        self.annot_path = os.path.join(
          self.data_dir, 'annotations', 
          'instances_extreme_{}2017.json').format(split)
      else:
        self.annot_path = os.path.join(
          self.data_dir, 'annotations', 
          'instances_{}2017.json').format(split)
    self.max_objs = 128
    self.class_name = [
      '__background__', 'person', 'bicycle', 'car', 'motorcycle', 'airplane',
      'bus', 'train', 'truck', 'boat', 'traffic light', 'fire hydrant',
      'stop sign', 'parking meter', 'bench', 'bird', 'cat', 'dog', 'horse',
      'sheep', 'cow', 'elephant', 'bear', 'zebra', 'giraffe', 'backpack',
      'umbrella', 'handbag', 'tie', 'suitcase', 'frisbee', 'skis',
      'snowboard', 'sports ball', 'kite', 'baseball bat', 'baseball glove',
      'skateboard', 'surfboard', 'tennis racket', 'bottle', 'wine glass',
      'cup', 'fork', 'knife', 'spoon', 'bowl', 'banana', 'apple', 'sandwich',
      'orange', 'broccoli', 'carrot', 'hot dog', 'pizza', 'donut', 'cake',
      'chair', 'couch', 'potted plant', 'bed', 'dining table', 'toilet', 'tv',
      'laptop', 'mouse', 'remote', 'keyboard', 'cell phone', 'microwave',
      'oven', 'toaster', 'sink', 'refrigerator', 'book', 'clock', 'vase',
      'scissors', 'teddy bear', 'hair drier', 'toothbrush']
    self._valid_ids = [
      1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 
      14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 
      24, 25, 27, 28, 31, 32, 33, 34, 35, 36, 
      37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 
      48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 
      58, 59, 60, 61, 62, 63, 64, 65, 67, 70, 
      72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 
      82, 84, 85, 86, 87, 88, 89, 90]
    self.cat_ids = {v: i for i, v in enumerate(self._valid_ids)}
    self.voc_color = [(v // 32 * 64 + 64, (v // 8) % 4 * 64, v % 8 * 32) \
                      for v in range(1, self.num_classes + 1)]
    self._data_rng = np.random.RandomState(123)
    self._eig_val = np.array([0.2141788, 0.01817699, 0.00341571],
                             dtype=np.float32)
    self._eig_vec = np.array([
        [-0.58752847, -0.69563484, 0.41340352],
        [-0.5832747, 0.00994535, -0.81221408],
        [-0.56089297, 0.71832671, 0.41158938]
    ], dtype=np.float32)
    # self.mean = np.array([0.485, 0.456, 0.406], np.float32).reshape(1, 1, 3)
    # self.std = np.array([0.229, 0.224, 0.225], np.float32).reshape(1, 1, 3)

    self.split = split
    self.opt = opt

    print('==> initializing coco 2017 {} data.'.format(split))
    self.coco = coco.COCO(self.annot_path)
    self.images = self.coco.getImgIds()
    self.num_samples = len(self.images)

    print('Loaded {} {} samples'.format(split, self.num_samples))

  def _to_float(self, x):
    return float("{:.2f}".format(x))

  def convert_eval_format(self, all_bboxes):
    # import pdb; pdb.set_trace()
    detections = []
    for image_id in all_bboxes:
      for cls_ind in all_bboxes[image_id]:
        category_id = self._valid_ids[cls_ind - 1]
        for bbox in all_bboxes[image_id][cls_ind]:
          bbox[2] -= bbox[0]
          bbox[3] -= bbox[1]
          score = bbox[4]
          bbox_out  = list(map(self._to_float, bbox[0:4]))

          detection = {
              "image_id": int(image_id),
              "category_id": int(category_id),
              "bbox": bbox_out,
              "score": float("{:.2f}".format(score))
          }
          if len(bbox) > 5:
              extreme_points = list(map(self._to_float, bbox[5:13]))
              detection["extreme_points"] = extreme_points
          detections.append(detection)
    return detections

  def __len__(self):
    return self.num_samples

  def save_results(self, results, save_dir):
    json.dump(self.convert_eval_format(results), 
                open('{}/results.json'.format(save_dir), 'w'))
  
  def run_eval(self, results, save_dir):
    # result_json = os.path.join(save_dir, "results.json")
    # detections  = self.convert_eval_format(results)
    # json.dump(detections, open(result_json, "w"))
    self.save_results(results, save_dir)
    coco_dets = self.coco.loadRes('{}/results.json'.format(save_dir))
    coco_eval = COCOeval(self.coco, coco_dets, "bbox")
    coco_eval.evaluate()
    coco_eval.accumulate()
    coco_eval.summarize()
